double-threaded screw

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• double-threaded screw — noun (engineering) A screw having two threads, whose pitch is half the lead (also two start thread) • • • Main Entry: ↑double …   Useful english dictionary

• Double-threaded — Dou ble thread ed, a. 1. Consisting of two threads twisted together; using two threads. [1913 Webster] 2. (Mech.) Having two screw threads instead of one; said of a screw in which the pitch is equal to twice the distance between the centers of… …   The Collaborative International Dictionary of English

• Screw — This article is about the fastener. For other uses, see Screw (disambiguation). Screws come in a variety of shapes and sizes for different purposes. U.S. quarter coin (diameter 24 mm) shown for scale. A screw, or bolt, is a type of fastener… …   Wikipedia

• Screw thread — Internal and external threads illustrated using a common nut and bolt. The screw and nut pair can be used to convert torque into linear force. As the screw (or bolt) is rotated, the screw moves along its axis through the fixed nut, or the non… …   Wikipedia

• Female screw — Female Fe male, a. 1. Belonging to the sex which conceives and gives birth to young, or (in a wider sense) which produces ova; not male. [1913 Webster] As patient as the female dove When that her golden couplets are disclosed. Shak. [1913… …   The Collaborative International Dictionary of English

• two-start thread — see ↑double threaded screw under ↑double • • • Main Entry: ↑two …   Useful english dictionary

• Skew arch — A skew arch (also known as an oblique arch) is a method of construction that enables an arch bridge to span an obstacle at some angle other than a right angle. This results in the faces of the arch not being perpendicular to its abutments and its …   Wikipedia

• environmental works — ▪ civil engineering Introduction       infrastructure that provides cities and towns with water supply, waste disposal, and pollution control services. They include extensive networks of reservoirs, pipelines, treatment systems, pumping stations …   Universalium

• hand tool — any tool or implement designed for manual operation. * * * Introduction  any of the implements used by craftsmen in manual operations, such as chopping, chiseling, sawing, filing, or forging. Complementary tools, often needed as auxiliaries to… …   Universalium

• History of the single-lens reflex camera — The history of the single lens reflex camera predates the invention of photography in 1826/27 by one and a half centuries with the use of a reflex mirror in a camera obscura first described in 1676. Such SLR devices were popular as drawing aids… …   Wikipedia

• Wrench — For other uses, see Wrench (disambiguation). A set of chrome vanadium metric wrenches, open at one end, box/ring at the other. This type is commonly known as a combination wrench. A wrench or spanner is a tool used to provide grip and mechanical… …   Wikipedia